INFINITI®
K 160-199
Indoor Residential and Tankless Water Heaters
Warning:
Follow each appliance's instructions precisely.
Installation and service must be performed by a trained and
certified installer, service agency or the gas supplier.
Application drawings in this manual are conceptual only
and do not purport to address all design, installation, code,
or safety considerations.
The diagrams in this manual are for reference use by code
ocials, designers and licensed installers. It is expected
that installers have adequate knowledge of national and
local codes, as well as accepted industry practices, and
are trained on equipment, procedures, and applications
involved. Drawings are not to scale.
Refer to the appliance and accessory installation manuals
for additional detailed information!
APPLICATIONS MANUAL
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Table of Contents
1 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
4
1.1Key to symbols 4
1.2 Safety 4
2INTRODUCTION5
3WATER HEATER SIZING AND SPECIFICATIONS
6
3.1 Sizing tankless water heaters6
3.2 Tankless water heater accessories 7
3.3Tankless water heater specifications 8
4APPLICATIONS
9
4.1 Single Infiniti® K Installation 9
4.2 Pump sizing for circulation 10
4.3 Domestic hot water circulation 14
4.2.2 Pump wiring setup 13
4.2.1 Pump curves 12
4.2.1 External recirculation pump selection 11
4.3.1 Single Infiniti® K with domestic hot water recirculation installation 15
4.3.2 Domestic hot water recirculation with external pump 16
4.3.3 Adjusting the recirculation settings 16
4.4Tank loading 17
4.4.1 Single Infiniti® K tank loading installation 18
4.4.2 Single Infiniti® K tank loading with recirculation installation19
4.4.3 Multiple Infiniti® K tank loading installation 20
4.4.4 Multiple Infiniti® K tank loading with recirculation installation 21
4.5 Space heating 22
4.5.1 Single Infiniti® K with hydronic air handler installation 22
TABLE OF CONTENTS
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1 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
WARNINGS
The following keywords are defined and can be used in this
document:
• DANGER indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
• WARNING indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
• CAUTION indicates a hazardous situation which, if not
avoided, could result in minor to moderate injury.
• NOTICE is used to address practices not related to personal
injury.
IMPORTANT INFORMATION
This symbol indicates important information where there
is no risk to people or property.
WARNING:
Warnings in this document are identified
by a warning triangle printed against a grey
background. Keywords at the start of a warning
indicate the type and seriousness of the ensuing
risk if measures to prevent the risk are not taken.
WARNING:
These instructions are intended as an aid to
qualified licensed service personnel for proper
installation, adjustment and operation of this
unit. Read these instructions thoroughly before
attempting installation or operation. Failure to
follow these instructions may result in improper
installation, adjustment, service or maintenance
and possibly resulting in fire, electrical shock,
property damage, personal injury or death.
WARNING:
Disconnect all power to the unit before starting
any service and maintenance. Failure to do so
could cause severe electrical shock resulting in
personal injury or death.
WARNING: INSTALLATION REQUIREMENTS
Installation or servicing of this unit can be
hazardous due to parts, components and
system pressure. Qualified and proper trained
service personnel should perform installation
and repair. Failure to do so could cause severe
electrical shock resulting in personal injure or
death.
PLEASE READ SAFETY PRECAUTIONS BEFORE INSTALLATION.
1.1 KEY TO SYMBOLS
1.2 SAFETY
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2 INTRODUCTION
This Applications Manual is intended to present some of the
most common applications of the Infiniti® K Series tankless
water heaters. Application drawings are shown with both
piping and corresponding electrical schematics where
applicable. Auxiliary equipment depicted does not
necessarily represent any one manufacturer or specific model
number. There are a wide variety of techniques, practices and
piping strategies possible when installing water heating
appliances. It is the responsibility of the installing contractor
to determine the best solution for the application.
Although this manual covers many common applications for our
products, system possibilities are virtually endless. Should you
encounter an application that is not covered in this manual or have
any questions regarding any of its content, we encourage you to
contact your local sales representative or us directly at Bradford
White Corporation.
This manual is not a substitute for any of the appliance installation
manuals. All specifi cations are subject to change.
Installation must conform with local codes or, in the
absence of local codes, the National Fuel Gas Code ANSI
Z223.1/NFPA 54.
In Canada: Installation must conform with CGA B149.(1,2)
INSTALLATION CODES and/or local installation codes.
NOTICE: All drawings are conceptual in nature and do not
address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be
needed. Drawings are for reference use by ocials,
designers and licensed installers. It is expected that
installers have adequate knowledge of accepted
industry practices for the equipment, procedures, and
applications involved. It is the responsibiltiy of the
installer to ensure that the installation is in accordance
with local building codes.
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3 WATER HEATER SIZING AND SPECIFICATIONS
RULE OF THUMB SIZING
The tables below provide a general rule of thumb when sizing for
most residential applications. For commercial applications or for a
more detailed sizing method, use the Sizing by Chart instructions
below in conjunction with the charts on the next page.
SIZING BY CHART
• Measure the flow rates at each fixture that will be used
simultaneously and add them together. If only one
application will be used at a time measure each fixture and
use the maximum flow rate observed.
• Using a known volume container, record several fill times.
Perform the calculation below to determine the flow rate (a
one gallon fill time of 30 seconds is 2.0 gallons per minute
(GPM):
3.1 SIZING TANKLESS WATER HEATERS
This section describes the Infiniti® K water heaters from Bradford
White Corporation and provides a general overview to the
specification sheets and model. More detailed information is
contained in the installation manuals.
Download manuals at www.bradfordwhite.com.
Flow rate (GPM) =
Volume (gallons)
Fill time (sec)
sec
min
x 60
• Using a thermometer, measure the incoming water
temperature. For reference, see average ground water
temperature map. Subtract this temperature from the
desired hot water temperature to get the degree rise. If
the desired hot water temperature is 120F and incoming
temperature is 55F, the desired degree rise is 65F.
EXAMPLE
• Required flow rate of 2.0 GPM at a 65˚F rise.
• Refer to the graphs on page 10.
See Table 1 for multiple fixture possibilities and hot water flow
rates at given inlet water temperatures with a water heater set
point temperature of 120°F.
CA
OR
WA
ID
NV
MT
WY
UT
AZ
NM
CO
ND
SD
NE
TX
OK
KS
MN
IA
MO
AR
LA
MI
IN
IL
WI
GA
AL
MS
TN
KY
WV
VA
NC
SC
FL
NH
VT
NY
PA
OH
NJ
RI
CT
MA
ME
MD
DE
WA
OR
CA
NV
ID
U
T
A
Z
NM
CO
WY
MT
ND
SD
NE
K
S
O
K
TX
LA
AR
MO
IA
MN
WI
MI
IL
IN
OH
KY
TN
M
S
AL
GA
FL
S
C
N
C
VA
WV
PA
NY
MA
A
VT
NH
ME
˚F
77˚
72˚
67˚
62˚
57˚
52˚
47˚
42˚
37˚
Figure 1 Average ground water temperatures
Figure 1: Average ground water temperatures
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ACCESSORY
PART NUMBER
External NTC 7736505666
30’ extension cable for outdoor HMI 7736505664
Aquastat Connector 7736505665
3.2 TANKLESS WATER HEATER ACCESSORIES
Table 2
Table 1: Maximum hot water flow rate at 120°F set point temperature
Inlet temperature (°F)
MODEL 77° 72° 67° 62° 57° 52° 47° 42° 37°
Infiniti® K 199
9.3 GPM 8.3 GPM 7.5 GPM 6.9 GPM 6.3 GPM 5.9 GPM 5.5 GPM 5.1 GPM 4.8 GPM
Infiniti® K 160
7.5 GPM 6.7 GPM 6.1 GPM 5.6 GPM 5.1 GPM 4.8 GPM 4.4 GPM 4.1 GPM 3.9 GPM
Showerhead – 2 GPM
Sink faucet – 1 GPM
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Table 3
These flow are based upon setting the unit to higher temperatures and then mixing
down using cold water after the unit, to reach these flow rates.
Input rating is based on sea level operation and need not be changed for operation
up to 2000 ft (610 m) elevation. For operation at elevations above 2000 ft (610 m),
input rating is automatically reduced at the rate of 4 percent for each 1000 ft (305 m)
above sea level.
When converted to LPG the minimum input is 17000 BTU/hr (5 kW).
With constant flow.
Can be programmed to achieve up to 140 °F (60 °C).
Requirements: Steady flows, single unit installations, up to 140 °F (60 °C).
To measure Gas Pressure, see installation manual - Measuring Gas Pressure, chapter
4.13, page 36.
Refers to activation point. Deactivation point value is 0.35GPM (1.3 l/min).
Protection against water drops.
3.3 TANKLESS WATER HEATER SPECIFICATIONS
DESCRIPTION UNIT RTG-K-160 RTG-K-199
Performance
Maximum gas input
2
BTU/hr (kW) 160,000 (46.64) 199,000 (58.3)
Minimum input
3
BTU/hr (kW) 9,000 (2.6) 9,000 (2.6)
Maximum output BTU/hr (kW) 57,608 (46.2) 1 197,010 (57.7)
Thermal e ciency (E ciency in %) % > 99% > 99%
Maximum flow rate at a 35 °F (19.4 °C) rise GPM (l/min) 9.0 (34) 11.2 (42.4)
Maximum flow rate at a 45 °F (25 °C) rise GPM (l/min) 7.0 (26.7) 8.7 (27.7.9)
Maximum flow rate at a 55 °F (30.6 °C) rise GPM (l/min) 5.8 (21.9) 7.2 (27.5)
Maximum flow rate at a 75 °F (41.7 °C) rise GPM (l/min) 4.2 (15.9) 5.2 (19.7)
Maximum flow rate at a 90 °F (50 °C) rise GPM (l/min) 3.5 (13.2) 4.4 (16.6)
Temperature Control
4
Selection range °F ( °C) 100 - 120 (38 - 49) 100 - 120 (38 - 49)
Default temperature °F ( °C) 120 (49) 120 (49)
Temperature stability °F ( °C) ± 2 (± 1) ± 2 (± 1)
Gas Requirement
Gas connection inches ¾" ¾"
Inlet gas pressure range NG / LP 7 Inch W.C. 3.5” - 10.5” / 8” - 13” 3.5" - 10.5" / 8" - 13"
Water
Top hot water connection NPT inches ¾" ¾"
Top cold water connection NPT inches ¾" ¾"
Minimum water flow GPM (l/min) 0.45 (1.7) 0.45 (1.7)
Maximum water pressure PSI (bar) 150 (10.3) 150 (10.3)
Minimum recommended water pressure PSI (bar) 18 (1.2) 18 (1.2)
Minimum well pressure PSI 30 30
Water valve material – Polymer (PPS) (Polypropylene) Polymer (PPS) (Polypropylene)
Combustion
CO level ppm ≤ 250 (measured) ≤ 250 (measured)
CO2 level (set from factory) % see installation manual see installation manual
Weight
Net weight pounds (kg) 73.2 (33.20) 77.5 (35.15)
Gross weight pounds (kg) 79.37 (36.0) 83.67 (37.95)
Electrical
Voltage V AC 120 120
Frequency Hz 60 60
Amperage (Idle) mA 40 40
Amperage (operation) A ≤ 2.7 ≤ 2.7
Water protection
9
IP X4D X4D
Venting
Venting category − IV IV
Approved vent or combustion air pipe material - United States − PP fl exible/concentric/rigid, PVC sched. 40, PVC-DWV, CPVC sched. 40, ABS-DWV sched. 40
Approved vent or combustion air pipe material - Canada − CSA or ULC certified only (ULCS636)
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| Infiniti™ K 160-1999 Application Manual
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4.1 SINGLE INFINITI®
K INSTALLATION
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices
may be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and
local codes. Best installation practices should be followed.
4 APPLICATIONS
1) as required by local code
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The following section outlines pump sizing for domestic hot water
recirculation and tank loading. Only models approved for such
applications are listed in this section.
• Size the pump according to the pressure drop curve of your
Infiniti® K model (fig. 1 below) and the loop pressure drop
tables.
• Maximum flow allowed for tank loading through the pump
loop is 5 GPM.
• Must be 0.45 gpm to activate unit
• DHW recirc loop pump must circulate enough gpm to
account for normal loop heat loss and to ensure that the
recirc pump eventually satisfies and turns o
4.2 PUMP SIZING FOR CIRCULATION
For direct DHW recirculation and tank loading
applications: Run the system for 30 minutes to remove
debris from the plumbing. Then remove the unit‘s inlet
water filter to decrease pressure drop through the
system. If the inlet water filter, when removed, contains
debris, it is recommended to install a 40 mesh Y-strainer
(installer supplied) on the cold water inlet.
Figure 2
PRESSURE DROP CURVE
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4.2.1 EXTERNAL RECIRCULATION PUMP SELECTION
4.2.1 EXTERNAL RECIRCULATION PUMP SELECTION
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4.2.2 PUMP WIRING SETUP
EXTERNAL TIMER CONTROLLED PUMP WIRING
INFINITI K CONTROLLED PUMP WIRING
DISCLAIMER: Images are for reference only and all installations must comply with local installation codes, or in the absence of local codes, the
National Electric Code.
Black, hot
wire from
120V
Receptacle
White, common
wire from 120V
Receptacle
Green, ground
wire from
120V
Receptacle
Green, ground
wire from
120V
Receptacle
Black, hot
wire from
120V
Receptacle
White, common
wire from 120V
Receptacle
To Infiniti K
pump
connection
Infiniti K
pump
connection
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| Infiniti™ K 160-19911 Application Manual
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4.3 DOMESTIC HOT WATER CIRCULATION
System conditions vary and each pump must be sized by
a professional to insure performance.
Refer to pump manufacturers flow vs pressure specifications to
select a pump that can provide adequate flow while
overcoming the pressure loss through the Infiniti® K and the
recirculation loop. Refer to figure 2 to determine pressure loss.
Use only bronze or stainless steel pumps. Do not use
pumps of iron construction as they will oxidize and clog
the inlet filter on the appliance.
• When properly installed in a direct recirculation application
the Infiniti® K will regulate water temperature in a recirculation
loop. A thermostatic mixing valve should be used if your
setpoint is greater than 120°F.
• When the loop temperature is within 1.8°F degrees of setpoint
the pump will turn off.
• When the loop temperature is 1.8°F degrees less than the
setpoint the pump will turn on.
• Infiniti® K pump will also turn off after approximately 1 minute
in cases where there is no flow thru the recirculation loop
such as when a crossover valve is installed at the farthest
fixture. Unit will check for flow after approximately 4 minutes
by operating the pump for 10 seconds in order to determine if
the crossover valve has reopened.
EXAMPLE
• Infiniti® K temperature setting: 120°F
• Pump turn ON temperature </= 118°F
• To minimize energy costs:
i. Insulate all pipes in the recirculation loop.
RECIRCULATION LOOP PRESSURE DROP AT 2GPM
(FEET OF HEAD)
Table 4 Source: 2009 International Plumbing Code
Once the loop head loss has been calculated, use the pump
manufacturer’s performance curves to select the proper potable
water circulator at the required flow rate.
For
other desired gpm flow rates, please consult IPC for appropriate
pressure drop.
EXAMPLE
Sizing a pump for a 2gpm direct DHW recirc system with
an Infiniti® K 199 and have 150 ft total loop length.
HEAD LOSS LOOP COMPONENT
9.00 ft
1.20 ft
5.90 ft
0.24 ft
0.10 ft
0.72 ft
+ 0.18 ft
17.34 ft
Infiniti® K 199 (See Fig.2, page 10)
80 ft of ¾" copper
70 ft of ½" copper return
8 x ¾" 90 elbows
2 x ¾" Tees (branch)
8 x ½" 90 elbows
1 x ½" Tee (branch)
Minimum Pump Head at 2.0 gpm
Material
10 ft Pipe 90˚ Elbow 45˚ Elbow Tee Branch
½" Type L Copper 0.85
0.09 0.05 0.18
¾" Type L Copper 0.15
0.03 0.01 0.05
¾" Pex 0.25
0.02 N/A 0.03
⅝" Pex 0.53 0.04 N/A 0.06
½" Pex 1.3 0.12 N/A 0.18
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| Infiniti™ K 160-19912 Application Manual
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4.3.1
SINGLE INFINITI®
K WITH DOMESTIC HOT WATER RECIRCULATION INSTALLATION
EXTERNAL RECIRCULATION PUMP
• Max pump amp draw: 5 amps
• Recirc temperature differential is defined by using built-in
tankless controller
• Pump is powered only when inlet temperature sensor is less
than the setpoint temperature of the unit by a fixed differential
• See Section 4.3.2, for specific temperature values
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices
may be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and
local codes. Best installation practices should be followed.
) as required by local code
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| Infiniti™ K 160-19913 Application Manual
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4.3.2 DOMESTIC HOT WATER RECIRCULATION WITH EXTERNAL PUMP
The following drawing is provided to outline one possible
recirculation design. This schematic is for illustration only and must
not be used for actual installation without appropriate engineering
and technical advice from a properly licensed professional in the
locality where the installation is made.
Fig. 29 Recirculation application
Comfort level
Delta T (˚F)
1 18
2 16
3 14
4 12
5 10
6 8
7 6
8 4
9 2
[1] Cold water supply
[2] Check valve
[3] Circulator pump
[4] Expansion tank
[5] Shuto valves
[6] PRV
[7] RTG-K-160/199N/Xl
4.3.3 ADJUSTING THE RECIRCULATION SETTINGS
The pump and burner turn ON and OFF based on a delta between
the set point temperature on the water heater and the inlet water
temperature sensor value. This delta is called the comfort level.
The higher the comfort level, the smaller the delta between the
set point temperature on the water heater and the inlet water
temperature sensor value, resulting in a hotter recirculation
system.
The smaller the comfort level, the larger the delta between the
set point temperature on the water heater and the inlet water
temperature sensor value, resulting in a cooler recirculation system.
Below is a graph illustrating how the comfort level value changes
the recirculation system's temperature.
Fig. 30 Pump activation and deactivation thresholds
A higher comfort level will result in longer pump run
times, which will consume more electricity and gas.
The comfort level can be adjusted to achieve the desired balance
between readiness of hot water at the point of use and energy
consumption.
Table 17 RS Menu
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| Infiniti™ K 160-19914 Application Manual
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4.4 TANK LOADING
Tank loading pairs tankless water heaters with storage tanks to
maximize peak flow for high demand applications. A tank load
system, because of the added storage, can provide a high peak
flow with fewer tankless units and lower installed cost.
Tank loading is recommend for high cycle applications such as
commercial kitchens with hand sprayers.
THESE GUIDELINES SHOULD BE FOLLOWED TO MAXIMIZE
SYSTEM OUTPUT:
• Ensure flow through each water heater is between 3.5-5.0
gpm. See recommended pump models in application section
of this manual.
• For best performance, plumb the system or configure the
tank to draw cold supply water into the water heater during
hot water use.
• Maintain a 20 degree temperature dierence between
tankless set-point and desired tank temperature.
• Do not use a cascading kit in a tank loading application.
• When multiple tankless water heaters are used, the total
equivalent length of piping to each unit should be kept roughly
equal. A reverse return piping scheme is recommended to
equalize flow through each water heater.
• For tank temperature settings above 120°F, the Bradford
White commercial model should be used.
RECIRCULATION LOOP PRESSURE DROP AT 2GPM (FEET OF HEAD)
Table 5 Source: 2009 International Plumbing Code
PRESSURE DROP VS. FLOW
Table 6
EXAMPLE
Sizing a pump for a 4GPM tank loading DHW system with a Infiniti®
K 199 and a 20 ft total loop length.
HEAD LOSS LOOP COMPONENT
22.00 ft
1.00 ft
0.80 ft
+ 0.30 ft
24.1 ft
Infiniti® K 199 (See Fig.2)
20 ft of ¾ copper
8 x ¾” 90 elbows
2 x ¾” Tees (branch)
Minimum Pump Head at 4.0 gpm
Once the loop head loss has been calculated, use the pump
manufacturer’s performance curves to select the proper potable
water circulator at the required flow rate.
# of units
Infiniti™ K 160 Infiniti™ K 199
1 20 feet of head @ 4gpm
21 feet of head @ 4gpm
2 20 feet of head @ 8gpm
21 feet of head @ 8gpm
3 20 feet of head @ 12gpm
21 feet of head @ 12gpm
4 20 feet of head @ 16gpm 21 feet of head @ 16gpm
5 20 feet of head @ 20gpm 21 feet of head @ 20gpm
6 20 feet of head @ 24gpm 21 feet of head @ 24gpm
7 20 feet of head @ 28gpm 21 feet of head @ 28gpm
8 20 feet of head @ 32gpm 21 feet of head @ 32gpm
9 20 feet of head @ 36gpm 21 feet of head @ 36gpm
10 20 feet of head @ 40gpm 21 feet of head @ 40gpm
Material
10 ft Pipe 90˚ Elbow 45˚ Elbow Tee Branch
¾" Type L Copper 0.48
0.1 0.03 0.15
1" Type L Copper 0.14
0.04 0.02 0.07
1.25" Type L Copper 0.06
0.02 0.01 0.04
1.5" Type L Copper 0.03 0.01 <0.01 0.02
2" Type L Copper 0.01 <0.01 <0.01 0.01
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4.4.1
SINGLE INFINITI®
K TANK LOADING INSTALLATION
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may
be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local
codes. Best installation practices should be followed.
Table 7
RECOMMENDED PUMP
) as required by local code
Manufacturer
Model
Grundfos UP 26-99 SF
Taco 0013 SF3
B & G
PL-36B
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| Infiniti™ K 160-19916 Application Manual
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IMAGE TO COME
4.4.2
SINGLE INFINITI®
K TANK LOADING WITH RECIRCULATION INSTALLATION
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may
be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local
codes. Best installation practices should be followed.
Table 7
RECOMMENDED PUMP
) as required by local code
Manufacturer
Model
Grundfos UP 26-99 SF
Taco 0013 SF3
B & G PL-36
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| Infiniti™ K 160-19917 Application Manual
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4.4.3
MULTIPLE INFINITI®
K TANK LOADING INSTALLATION
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may
be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local
codes. Best installation practices should be followed.
) as required by local code
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